Safety device for two-revolution printing-presses.



No. 809,748. PATENTED JAN. 9, 1906. M. ROGKSTROH.

SAFETY DEVICE FOR TWO REVOLUTION PRINTING PRESSES.

APPLICATION FILED AUG- 7. 1905.

2 SHEETS-SHEET 1.

PATBNTED JAN. 9, 1906.

M. ROOKSTROH.

SAFETY DEVICE FOR TWO REVOLUTION PRINTING PRESSES.

APPLICATION FILED AUG. 7, 1905.

2 SHEETS-SHEET 2.7

UNITED STATE S PATENT orrron.

SAFETY DEVICE FOR TWO-REVOLUTION PRlNTlNG-PREssEsl Specification ofLetters Patent.

Patented Jan. 9, 1906.

Application filed August 7, 1905. Serial No. 273,151.

To ctZZ 1072,0112 it may concern:

Be it known that 1, MAX Rooxs'rnon, director of the MaschinenfabrikRockstroh & Schneider Nachf, Actien Gesellschaft, of Dresden-Heidenau,Saxony, in the German Empire, have invented certain new and usefulImprovements in Safety Devices for Two- Revolution Printing-Presses, ofwhich the following is a clear and distinct description.

Safety devices consisting of a throw-off lever have become known inconnection with platen printing-presses by means of which whenever thehand of the operator comes accidentally in contact with the safetydevice, and thereby changes its position, the press is thrown out ofengagement and the revolution of the fly-wheel arrested, the hand beingconsequently protected against injury. In two-revolutionprinting-presses there is risk of injury to the operator whenever thelatter attempts at the last moment, while the carriage carrying the formis already in motion, to make level types picks, as they are called,which may happen to stand out somewhat from the general level of theform. If that is done, the operator runs the risk of having his handcaught between the inking and distributing cylinders. In order toobviate this risk, there has been provided, in printing-presses ofthetype to which this invention relates, a safety device of a similarcharacter as has already been employed in connection with platenprinting-presses, consisting of a rotating throw-off lever, which isfixed in front of the rollers and above the form and the position ofwhich is changed by the hand of the operator coming in contact with itto such an extent that it releases a connecting-rod actuated by aspring, by which means the press is thrown out of engagement and therevolution of the fly-wheel is simultaneously arrested.

Figure 1 of the accompanying drawings is a side elevation, partially insection, on the line a: :r of Fig. 2 of a two-revolution printingpressprovided with the safety device in accordance with the invention. Fig. 2shows a plan of the safety device. Fig. 3 shows in elevation, and Fig. 4in verticalsection, on the line y y of Fig. 3 the position of thebrakelever of the fly-wheel.

. The throw-off lever a is rotatably mounted by pivots I), fixed to theframe of the press. The horizontal arm of the lever a lies so closelyabove the form that there is not sufficient space for the hand of theoperator to pass between it and the form without touching the lever. Aconnecting-rod A, one end of which moves in a sleevef 011 the frame,while its other end is flexibly connected with a lever g, by means ofwhich the press is uncoupled and again put in engagement, runs along theside pivoted end of the bearing-arm of the throw- 7 off lever (1,projects beyond the edge of the disk at when the press is in engagementand keeps the spring 0 under tension. The lever g is rigidly connectedwith the vertical rocking shaft 72, which for the purpose of enablingthe press to be put in engagement is provided at its upper end with ahandle 1". The forked lever Z, rigidly mounted upon the rocking shaft h,engages with its fork a pin on the bar n of the belt-fork, the end ofwhich in proximity to the fly-wheel is provided with a camlikeprojection i, that actuates the brake-lever 0 of the fly-wheel. Thebrake-lever 0 is a bell-crank lever mounted to oscillate in a block orin the frame, one arm of it being pressed by means of a spring againstthe camlike projection of the bar n. The bar it in moving to and froraises and lowers the free arm of the bell-crank lever 0, the leveritself being turned in its bearings, while the other arm compresses orexpands a brake-ring arranged within the fly-wheel and so arrests therevolution of the latter at the same time with the press being thrownout of engagement or releases it again when the press is again coupled.

The mode of operating the device is as follows: If after the press hasbeen started the hand of the operator should come in contact with thethrow-off lever a, the latter will be pushed in the direction of thepress, with the result that the pressing of the hook 0 down andreleasing the disk d. The connectingrod A, actuated by the spring 0,presses forward and by means of the lever 9 turns the rocking shaft h,and the forked lever Z with it, in such a manner as to cause the latterto shift the bar it with the belt-fork m and the cam-like projection iin proximity to the fly Wheelto the lift. This results in the belt beingshifted from the rigidly-mounted pulley p to the loosely-mounted pulleyg-that is to say, the press is thrown out of engagement. The cam-likeprojection i on the bar a is at the same time brought beneath thebrake-lever and by actuating the same effects the stopping of thefly-Wheel. If it is intended to place the press again in engagement, itis necessary to turn the handle 1", and consequently the rocking shafth, in the opposite direction. By doing so the connecting-rod A is pushedback into its initial position and the spring 0 is again put undertension, While the disk (1 is caused to lie against a lateral projectionon the arm of the safety-lever, and so pushes the latter back into itsupright position. Thereupon the hook a Will again pass in front of thedisk 65 and retain the connecting-rod in the coupling position, the freearm of the bell-crank lever 0 being simultaneously lowered and theconnection between the brake-ring and the fly-Wheel uncoupled in thismanner.

device and adapted to be actuated by the throw-off lever. v

2. In a safety device for printing-presses, a throw-off lever having anarm projecting over the form of the latter, a belt-shifting elementhaving a braking device for the fly-Wheel of the press, aspringcontrolled rod engaging the belt-shifting element, and means forsetting the rod in an operative position, said throw-off levermaintaining the rod in a set position and adapted to release the sameWhen the hand of the operator is brought in contact therewith. 1

3. In a printing-press, a safety device including a throw-off leveradapted to extend over the face of the form of the press, a beltshiftingdevice, a brake member cooperative With the latter for arresting thefly-Wheel of the press, a spring-actuated rod connected With thebelt-shifting element, and a handoperable lever for setting the rod inan operatlve position, said throw-off lever adapted to release the rodfor operating the belt-shifting element and brake member When the handofthe operator contactswith said throw-off lever.

In testimony whereof I have hereunto set my hand in presence of tWosubscribing Witnesses.

MAX ROGKSTROH.

Witnesses:

PAUL E. SoHILLING, PAUL AREAS.

